- Joined
- Apr 26, 2012
- Messages
- 93
- Reaction score
- 46
Bob
Thanks for posting pictures of your Grasshopper - the build and finish look great to me - you should post your pictures and comments in a new Finished Projects thread, then others may more easily access your work.
In terms of the steam chest and valve plate I have always followed Elmer's design which follows full size practice - to effectively flat bottom the steam chest cavity would be very difficult to achieve with castings. I'm also surprised that you are able to obtain a sufficiently flat lapped surface inside the steam chest to achieve a metal to metal sliding seal with the valve - this is crucial if you are to get optimum performance.
Don't be put off by Elmer's spoked flywheel - he never intended it to require a rotary table - given that you successfully filed the Comber ring cam the flywheel should be a breeze. Having said that your version looks great.
Kind regards
Geoff at Inky Engines
Thanks for posting pictures of your Grasshopper - the build and finish look great to me - you should post your pictures and comments in a new Finished Projects thread, then others may more easily access your work.
In terms of the steam chest and valve plate I have always followed Elmer's design which follows full size practice - to effectively flat bottom the steam chest cavity would be very difficult to achieve with castings. I'm also surprised that you are able to obtain a sufficiently flat lapped surface inside the steam chest to achieve a metal to metal sliding seal with the valve - this is crucial if you are to get optimum performance.
Don't be put off by Elmer's spoked flywheel - he never intended it to require a rotary table - given that you successfully filed the Comber ring cam the flywheel should be a breeze. Having said that your version looks great.
Kind regards
Geoff at Inky Engines
